Master of Science II (Polymer Chemistry)
Examination: Oct Nov 2016 Semester III (New CBCS)
SLR No. Day
Date Time Subject Name Paper
No. Seat No.
SLR SD-
220
Friday
18/11/2016
02:30 P.M
to
05:00 P.M
Morphology and Physical
Chemistry of Polymers
C
X
Instructions: Attempt in all five questions.
All questions carry equal marks.
Section-I is compulsory.
Attempt any twoquestions from Section II and any two
questions from Section III.
Answer to all question (Section II and III) should be written
in the one answer book.
Figures to right indicate full marks.
Use of log table and calculators in allowed.
Total Marks:70
SECTION I
Q.1 Answer the following: 14
Write down the formulae used for determination of
Chain ended degradation is more economical random degradation, Give
reason.
Define the term solubility parameter and give its unit in SI.
Name any four factors affecting shape of DSC curve.
Why Molecular weight of a polymer is given in terms of average not absolute
value?
Name important products of oxidative degradation of NR.
What is Spherulite and what is it made up of?
SECTION II
Q.2 What is Tg? What is its importance? Discuss the factors affecting Tg of
polymers.
07
Describe the GPC method for determination of MW of polymers. List
advantages and limitations.
07
Q.3 What is thermal degradation? Describe the thermal degradation in poly (vinyl
chloride) in brief.
07
Discuss the free energy equation for monodisperse and polydisperse polymers
in terms of power series for Flory-Huggins theory.
07
Q.4 Using suitable diagram describe the XRD pattern of crystalline, amorphous
polypropylene. Write down the formula for degree of crystallinity of polymer
by XRD.
07
Describe in detail the end group analysis method for determination of MW. 07
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SECTION III
Q.5 Explain the process of oxidative degradation in polybutadiene. 05
Obtain the equating showing relationship between unperturbed dimension and
intrinsic viscosity of a polymer.
05
Calculate of polystyrene of a given 0.97 k=11x10-5 and a 0.725. 04
Q.6 Discuss the role of photostabillizers with suitable example for protection of
polymer from degradation.
05
Describe the dilatometry method used for determination Tg of a polymers. 05
Calculate the solubility parameter of PS having, density is 1.05g/cm3 and
molar attraction constant for benzene=735, for -CH2=133 and for -CH=28.
04
Q.7 Write a note on any three of the following: 14
WLF equation
Vapour Phase Osmometry
Machanical Degradation in Polymers
Thermodynamic Parameters and Polymer Dissolution
Polymer Single Crystal.